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Pure substances and mixtures
Pure substances and mixtures
Pure substances and mixtures
Pure substances and mixtures
Pure substances and mixtures
Pure substances and mixtures
Pure substances and mixtures
Pure substances and mixtures
Pure substances and mixtures
Pure substances and mixtures
Pure substances and mixtures
Pure substances and mixtures
Pure substances and mixtures
Pure substances and mixtures
Pure substances and mixtures
Pure substances and mixtures
Pure substances and mixtures
Pure substances and mixtures
Pure substances and mixtures
Pure substances and mixtures
Pure substances and mixtures
Pure substances and mixtures
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Pure substances and mixtures

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Chemistry for foreign students in Belarus. Lesson #2 Pure substances and mixtures …

Chemistry for foreign students in Belarus. Lesson #2 Pure substances and mixtures
Autor Yauheni Slizh
email: kiolk@tut.by
skype: tyteihi

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  • 1. Pure substances and mixtures Chemistry/topic 2
  • 2. As you know, every substance has a characteristic set (complex) of properties on which it can always be distinguished from any other substance. However, these properties are well-defined only for a single individual substance that is not mixed with other substances. So necessary to distinguish between pure substances from mixtures.
  • 3. • Pure are substances that do not contain impurities of other substances.
  • 4. Mixture - a collection of individual compounds that make up the physical body.
  • 5. Homogeneous refers to substances and mixtures which are in a single phase. from Ancient Greek ὁμογενής (homogenēs) from ὁμός (homos, “same”) followed by γένος (genos, “kind”)
  • 6. Heterogeneous in the sciences is a substance composed of dissimilar or diverse parts. from Ancient Greek ἑτερογενής (heterogenēs), from ἕτερος (heteros, “other, another, different”) respectively, followed by γένος (genos, “kind”).
  • 7. Types of mixtures
  • 8. Types of mixtures
  • 9. Suspension is a heterogeneous mixture containing solid particles that are sufficiently large for sedimentation. Usually they must be larger than 1 micrometer. A colloid is a substance microscopically dispersed throughout another substance. The dispersed-phase particles have a diameter of between approximately 1 and 1000 nanometers. Solution is a homogeneous mixture composed of only one phase. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent.
  • 10. Sedimentation (Defending) • This is one of the easiest methods of separation. It is based on the fact the fact that the components of the mixture have different density. This method can be divided heterogeneous mixture of two liquids, such as oil and water, liquids and solids (sand and water).
  • 11. Filtration • When filtering requires a special filter. Filter can serve as special paper, special glass, gauze or cotton. The use of filters depends on how big the particles of one component of the mixture. We will try to divide a heterogeneous mixture of solid and liquid substances, water and chalk.
  • 12. Sedimentation, Decantation and Filtration
  • 13. Evaporation • The method is based on the fact that different materials have different degrees of volatility. For example, water and alcohol are volatile substances, salt and alkali non-volatile. Take a mixture of salt and water. This mixture is homogeneous or not? Will heat the mixture. What's going on? The water evaporates and condenses on the glass, the salt remains in a solid. Tell me, which one of the components of the mixture is volatile? • This method is widely used in the extraction of salt from natural brine.
  • 14. Time Lapse Formation of Salt Crystals (Evaporation)
  • 15. Distillation • The method is based on the fact that different components of the mixture have different boiling points. Most often, this method is used to separate a homogeneous mixture of liquid substances.
  • 16. Separation of Mixtures using Fractional Distillation - OLabs- Amrita University(Distillation)
  • 17. Recap quiz: 1) Give examples of almost pure substances with which you meet in everyday life. 2) Give five examples of homogeneous and heterogeneous mixtures, you meet every day 3) How to distinguish a pure substance from a mixture of substances?
  • 18. Recap quiz: 4) Homogeneous or heterogeneous mixture is formed by mixing: • a) alcohol and water; • b) flour and water • a) starch and sugar; • d) of oil and water • e) weak tea and sugar; 5) Why is not found in nature is pure water? 6) What are the methods most often used for the separation of homogeneous mixtures? 7) What are the methods most often used for the separation of heterogeneous mixtures?
  • 19. Home task: • Learn definitions which you wrote on the lesson • Pleas write 5 examples of the types of mixtures which you are using in your life?
  • 20. • https://www.facebook.com/groups/267369 803416703/ • kiolk@tut.by • Skype: tyteishi

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